Blow-off cock.



J. B. YOUNGBLOOD.

BLOW-OFP COCK.

APPLIUATIoN FILED MAR. so, 1909.

Patented Dec. 14,1909.

JOHN B. YOUNGBLOOD, OF CLEVELAND, OHIO.

LBLOVWOFE` COCK.

Specification of Letters Patent.

Patented Dec. 14, 1969.

Application filed March 30, 1909. Serial No. 486,648.

To all whom it may concer/n:

Be it known that I, JOHN B. YoUNGBLooD, a citizen of the United States,residing at Cleveland, in the county of Cuyahoga and State of Ohio, haveinvented certain new and useful Improvements in Blow-Off Cocks, of whichthe following is a specification.

My invention relates to valves,'and more particularly to those valvestermed blow-off cocks, and the object is to provide an improved blow-olfcock in general, and one embodying a novel pressure seated self-grindingvalve. 1

In the accompanying drawings, which illustrate my invention, and form apart of this specification, Figure 1 is a vertical sectional viewthrough my improved blow-off1 cock, and Fig. 2 is a horizontal sectionalview taken therethrough on the line 19-19 of Fig. 1.

In the embodiment of my invention, as shown, I provide a valve casing 1,comprisin an inlet 1S, and an outlet 17, and having a diaphragm 2Obetween said inlet and outlet, and a flange plate 2, at the upper end ofits valve bore, said plate 2, having an upwardly and inwardly projectingfinger 3, engaging within a curved slot 4, in the periphery of the plug5, adjacent its upper end, provided with a nut 21, by which it may beturned. The diaphragm 20, has a threaded opening in its horizontalportion in which is screwed a removable valve seat 9, against which avalve disk 8, seats upwardly, and downwardly upon which the lower end ofplug 5, extends, said plug having a central bore, cored out from itslower end, and an opening 15, through its wall communicating with saidbore, and through the same, with the inlet side of the diaphragm 20,when disk 3 is unseatcd.

The disk 8, has an annular threaded flange upon its lower face, by whichit may be screwed within the cup-shaped head 10, of a depending guidestem 12, extending into a tubular extension 13, of casing 1, saidcupshaped head having a central squared recess 11, in its base. Thevalve stem 6, is threaded through the upper end of the plug 5, andextends loosely through valve disk 3, and is provided with a square head7, within the :up-shaped member 10. Thus the valve, comprising disk 8,and the cup-shaped member 10, is a buoyant one, and will be held seatedby the boiler pressure through inlet 13, plug 5, when turned to thedotted position in Fig. 2, assuring a perfectly tight closure. Byopening plug 5, and screwing disk 8,downwardly, the boiler may blow-ofiIthrough 17, also water may be supplied to the boiler through 17, whenplug 5, and disk 8, are open, the water forcing disk 8, down when thestem head 7, is lowered in the cupshaped member 10, and any backpressure closing the same. Further, by the construction described, thedisk 8, will be ground against its seat each time the same is opened,inasmuch as head 7, of stem 6, will engage within the recess 11, ofmember 10, and rotate the said disk several times before pushing thesame from its seat. However, to satisfactorily re-grind the valve uponits seat without danger of defacing it, or the seat, I prefer to closeplug 5, when there is no pressure from the boiler, the buoyancy of thevalve being the only thing which holds it against its seat.

Having thus described my invention, what I claim is:

1. In a device of the character described, the combination of anupwardly seating buoyant valve, and a stem controlling the same havinglongitudinal movement with relation thereto, and means relativelyengaging between said valve and said stem to ron tate the former beforemovement thereof away from its seat.

2. In a device of the character described, the combination of a casinghaving a diaphragm forming a horizontal valve seat, a plug extendingdownwardly against said seat having a central bore and an openingthrough its wall communicating with said bore and provided with meansupon its upper outer end to control rotative movement thereof, a valveseated upwardly against said valve seat, a stem for controlling saidvalve, longitudinally movable with relation thereto, and relativelyengaging means carried by said stem and said valve for rotating thelatter' upon its seat.

3. In a valve of the character described, the combination of a diaphragmembodying a valve seat, a valve disk for engagement upwardly againstsaid seat, a cup-shaped member upon which said disk is secured to form abuoyant valve, a rotatable stem projecting centrally downwardly throughsaid disk, and relatively engaging projections and recesses carried bysaid stem and the base of said cup-shaped member whereby to Causeseveral rotations of said disk against said seat before movingtherefrom.

4. A blow off cook comprising a Casing having an inlet and an outlet anda diaphragm forming a valve seat, a plug eX- tending downwardly uponsaid diaphragm, having a Central bore and an opening through its wallcommunicating with said bore, and having external means for rotating thesame, a buoyant check valve adapted to seat upwardly against saiddiaphragm, and a valve stem controlling said cheek having' means togrind the same upon its seat.

In testimony whereof I aiiix my signature, in presence of two witnesses.

JOHN B. YOUNGBLOOD.

